A reference for the amplifier interfaces was requested. Unfortunately, these things seem be to somewhat fluid at present, and much keeps changing. The citations that I had for the edit have themselves been heavily edited, and continue to be so.
Most of the problems seem to be connected to the current paranoia over unauthorised copying of disks or extracting the data for distribution by other means. Commercial interests also seem to play a part.
The 6 channel analogue interface is obvious enough, but players have been heavily critisised because, in most players, it is not possible to adjust the individual channel amplitudes or even the delay times. the only control available is a master level control.
The Firewire interface, misleadingly (for this application) referred to as DVI, has appeared on precious few players, mainly because the HDCP encryption that was supposed to protect it was broken before it was even deployed. It has appeared on even fewer amplifiers.
The SP/DIF (or TOSLINK) interface suffers from an even greater lack of information. The specifications for almost all players neglect to mention the limitations in any detail. Most will make some vague reference to the fact that individual disks may give rise to limitations on the way the disk is played. That's it - nothing more. I personally have one player that completely disables the SP/DIF output for all disks, and one player that downconverts to 48kHz/16 bit (except for disks flagged to allow the 96kHz/24 bit that they are recorded at - and I have one such disk).
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